3-Steps to Higher Amount Selectors on Your Shopify Theme

There are a number of choices relating to e-commerce amount selectors, however an interactive aspect appears to be essentially the most user-friendly for B2C retail websites. 

“interactive” amount selector usually implies that the person doesn’t want to drag up a menu or use their keyboard, they will simply faucet or click on proper on the display. Cool, proper?

So what in case your Shopify theme simply has the default HTML enter area? Perhaps you’ve acquired one thing that appears a bit like this (an especially small contact space for cell gadgets)… 

However you’re a sensible cookie that’s aiming for one thing extra intuitive (and aesthetically pleasing), like this…

Only one downside: your Shopify theme has an AJAX cart and you haven’t any thought tips on how to add performance for dynamically loaded components.

This walkthrough will present you tips on how to utterly combine new amount selector buttons and enhance your default Shopify retailer. Mobile1st was simply implementing this alteration for a shopper utilizing the Streamline theme, and we thought it might be useful to share these steps with you! Afterall, sharing is caring. 

Be aware: You’ll have to have fundamental information of HTML & CSS; and an understanding of how javascript works to set off a amount change when a person clicks in your new buttons.


I like to recommend making a replica of your stay theme earlier than modifying any code. Altering a stay theme could be very dangerous for those who’re not fully certain what you’re doing and/or making greater adjustments (like this one) that span a number of information. Working in a replica theme will will let you confirm and take a look at your adjustments in preview mode earlier than going stay. 

STEP 1: Add buttons to the amount selector

To set this up, you’ll go into the cart template or cart-drawer template and seek for “amount” to search out the enter aspect answerable for updating the amount of a given line merchandise. 

We’re then going so as to add a button above and beneath the amount enter; these will likely be used to extend/lower the worth.

<button sort=’button’ worth=’-‘ class=’qtyminus’> – </button>
<enter sort=”quantity” identify=”updates[]” id=”cart_updates_{{ merchandise.key }}” class=”cart__quantity” worth=”{{ merchandise.amount }}” min=”0″ data-id=”{{ merchandise.key }}” data-cart-item-input-quantity>
<button sort=’button’ worth=’+’ class=’qtyplus’> + </button>

The enter area was left as is, however you’ll need to take note of the button’s courses. For this tutorial, I’ve chosen the courses qtyminus and qtyplus which will likely be used once more later within the Javascript to find out how the amount must be modified. 

From right here, you might add in a little bit of Javascript to alter the amount on click on (usually). But when your cart makes use of AJAX to dynamically change the contents of the cart every time it’s up to date – you’ll see that your set off solely works on preliminary web page load. 

It’s because the AJAX is simply updating the web page content material, and never reinitializing your occasion handler. So your fancy new buttons are being destroyed and reloaded, however your occasion handler isn’t being reattached.

STEP 2: Inform your new buttons what to do

That is the place it will get enjoyable (or messy… I’m not right here to guage). 

Find a file referred to as theme.js and seek for one thing like “cart” or “AjaxCart” to search out the cart’s constructor. In the event you’re modifying the Streamline theme, that is referred to as “theme.AjaxCart”.

STEP 2a: Outline these variables

Search for the handler’s variable object, mostly named “selectors”. That is the place you’ll outline your “+” and “-” buttons. It is going to look one thing like this.

    var selectors = {
      type: ‘type.cart’,
      cartCount: ‘.cart-link__count’,
      updateBtn: ‘.update-cart’,
      itemList: ‘[data-cart-item-list]’,
      merchandise: ‘[data-cart-item]’,
      itemId: ‘[data-cart-item-id]’,
      itemHref: ‘[data-cart-item-href]’,
      itemBackgroundImage: ‘[data-cart-item-background-image]’,
      itemTitle: ‘[data-cart-item-title]’,
      itemVariantTitle: ‘[data-cart-item-variant-title]’,
      itemPropertyList: ‘[data-cart-item-property-list]’,
      itemProperty: ‘[data-cart-item-property]’,
      itemDiscountList: ‘[data-cart-item-discount-list]’,
      itemDiscount: ‘[data-cart-item-discount]’,
      itemDiscountTitle: ‘[data-cart-item-discount-title]’,
      itemDiscountAmount: ‘[data-cart-item-discount-amount]’,
      itemLabelQuantity: ‘[data-cart-item-label-quantity]’,
      itemInputQuantity: ‘[data-cart-item-input-quantity]’,

      itemDelete: ‘[data-cart-item-delete]’,
      itemPriceContainer: ‘[data-cart-item-price-container]’,
      itemLinePriceContainer: ‘[data-cart-item-line-price-container]’,
      itemUnitPrice: ‘[data-cart-item-unit-price]’,
      itemMessage: ‘[data-item-message]’,
      itemSubscriptionName: ‘[data-cart-item-subscription-name]’,
      cartDiscountContainer: ‘[data-cart-discount-container]’,
      cartDiscountContent: ‘[data-cart-discount-content]’,
      cartDiscount: ‘[data-cart-discount]’,
      cartDiscountTitle: ‘[data-cart-discount-title]’,
      cartDiscountAmount: ‘[data-cart-discount-amount]’,
      cartNoteContainer: ‘[data-cart-note-container]’,
      cartNoteInput: ‘[data-cart-note]’,
      cartMessage: ‘[data-cart-message]’,
      cartSubtotal: ‘[data-cart-subtotal]’,
      cartSubmit: ‘[data-cart-submit]’

Highlighted in orange are the traces I’ve added. *Relying on what class you’ve given your new buttons, this will likely look barely completely different. 

STEP 2b: Add occasion listeners

Additional down, there must be a prototype perform the place the occasion listeners are being outlined. We’ll be making fairly a number of updates right here. In orange are the traces I’ve added to hear for clicks on each of the buttons, and in blue is what I swapped from ‘enter’ to ‘change’.

    this.$container.on(‘click on’, selectors.itemInputMinus, this._updateQuantity);
        this.$container.on(‘click on’, selectors.itemInputPlus, this._updateQuantity);
        this.$container.on(‘click on’, selectors.itemDelete, this._onItemDelete.bind(this));
        this.$container.on(‘change‘, selectors.itemInput Amount, $.debounce
(500, this._onItemQuantityChange.bind(this)));
        this.$container.on(‘blur’, selectors.itemInputQuantity, this._onItemQuantityEmptyBlur.bind(this));
        this.$container.on(‘focus’, selectors.itemInputQuantity, this._highlightText);

STEP 2c: Flip button clicks into amount updates

Find the perform referred to as  “_onItemQuantityChange”, and place this subsequent perform simply above it (to maintain issues organized). 

      _updateQuantity: perform(evt){
        var $button = $(evt.goal).closest(‘button’);
        var $enter = $button.father or mother().discover(‘enter[type=”number”]’);
        var id = $enter.closest(selectors.merchandise).attr(knowledge.itemId);
        var amount = $enter.val();
        if ($button.hasClass(‘qtyplus’)) {
              amount = parseInt($enter.val()) + 1;
        } else {
          amount = parseInt($enter.val()) – 1;
        if (amount == 0) {
          var response = verify(theme.strings.cartConfirmDelete);
          if (response === false) {
        theme.cart.changeItem(id, amount);

This perform takes the occasion that simply occurred (ie. the button click on) and determines whether or not or not it ought to enhance or lower the enter worth. As soon as the brand new amount has been calculated, the perform calls “changeItem” – which has already been outlined within the theme’s javascript – to set off the AJAX replace on the cart. 

And since we’ve added this to the cart’s constructor, this code will proceed to work each time the content material is loaded. 

STEP 3: Check your code and make it mini 

That is going to get wordy, so bear with me. Remark out every part in theme.min.js and paste all the contents from theme.js (briefly) – simply to keep away from minifying code that doesn’t truly work. When you’ve verified that your code is operating as meant, head over to a Javascript minifier website and paste the code you simply copied. This gives you a minified model of the theme.js file. Minified javascript dramatically improves website velocity and accessibility (aka – a greater person expertise). Now you’ll return to theme.min.js, take away the unminified content material, and paste in your new minified theme code. 

Et voilà! You now have a user-friendly, aesthetically pleasing amount selector that’s utterly built-in into your Shopify theme. No duct tape required.

If this tutorial was a bit out of your depth, otherwise you typically end up in want of this sort of Shopify-related improvement, we’re right here to assist! Mobile1st is vital for shoppers similar to you; the last word optimization associate that may repeatedly enhance your conversion charges. Simply sit again and let our group of licensed Shopify Specialists provide the high-converting theme of your goals.

Mobile1st is a frontrunner in advertising and marketing expertise and website optimization options. Greater than prioritizing and executing business main CRO practices, we do what makes the cash; optimizing our Shopper’s digital commerce product towards constant monetary progress and ROI. All achieved via excellence in Lean UX, Analytics, Analysis, Experimentation and Growth.
Contact Mobile1st Specialists Now!

Alex Ortiz
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